Modified CPL models for dark energy and observational constraints

被引：0

作者：

Sardar, Gopal ^{[1
]}

Chakraborty, Subenoy ^{[1
]}

机构：

[1] Jadavpur Univ, Dept Math, Kolkata 700032, W Bengal, India

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2023年 / 38卷 / 35N36期

关键词：

Cosmology; CPL model; dark energy; ANISOTROPIC POWER SPECTRUM; COSMOLOGICAL CONSTANT; GALAXY SAMPLE; FIELD; I; EXPANSION; PARAMETER; PRODUCTS; GRAVITY; BAO;

D O I：

10.1142/S0217751X23501944

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

In this work, we consider two modified Chevallier-Polarski-Linder (CPL) models in the background of homogeneous and isotropic Friedmann-Lemaitre-Robertson-Walker (FLRW) space-time, namely, (i) the generalized CPL model (Model I) and (ii) the logarithmic form of the equation of state for the dark energy. From the observational data sets ((Pantheon+)+BAO+HST), we find that at the present epoch (redshift z=0), the equation of state for the dark energy converges almost at the same value omega fld approximate to-0.86 and the variation of omega fld(z) with respect to the redshift parameter is very small for both models. We also find that the present value of the Hubble parameter H0 is almost same for both the models. Finally, we compare the models in the light of Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC) and Bayesian evidence. However, we find that Model II is better compared to Model I from the estimated value of the deceleration parameter.

引用

页数：11

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